Typewriting and like machine



March 20, 1928. 1,663,374

F. A. HART TYPEWEITING AND LIKE MACHINE Filed Aug. 5. 1926 2 Sheets-Sheet 1 WITNESSES INVENTOR iuhm .4 4 m finv ATTORNEY March 20, 1928.

1,663,374 F. A. HART TYFEWRITING mi) LIKE mamas Filed Aug. 5. 1926 2 Sheets-Sheet 2 WiTNESSES INVENTOR Z w E 85 v ATTORNEY Patented Mar. 20, 1928.

UNITED. STATES TYPEWRITER COMPANY, OF ILION, NEW YORK. A. CORPORATION OF NEW YORK.

TYPEWRITING AND LIKE MACHINE.

. Application filed' Au uste, 1926. Serial 27,324.

My invention relates to typewriting and like machines which are equipped with traveling carriages, and more particularly to power operated return mechanism for such carriages.

The invention has for its principal objectof construction and combinations and ar-- rangements of parts, all of which will; be fully setforth herein and particularly pointed out in the claims. I i

One instance of the invention is illustrated in the accompanying drawings, all of which are more or less fragmentary in character, parts being omitted or broken away or shown in section. In said drawings,

Figure 1 is aleft-hand side elevation with the cover plate of the control box and some other parts removed, the mechanism being shown in normalposition.

Figure 2 is a side view of the control box with the cover removed, the parts being shown in the positions they occupy when-a certain disabling devicehas been operated.

Figure 3 is a view of a portion of the mechanism in front elevation, parts being shown in section on a plane through the axis of the vertical drive. shaft.

Figure 4 is a detail side view of the clutch.

Figure 5 is a. horizontal section through the same on the line 55 of Fig. 3. a

Figure 6 is an enlarged view of a detail in sect-ion on the line 66 of Fig. 1. v

Figure 7 is an enlarged View of a detail in section on the line '7-7 of Fig. 1.

Figure 8 is a plan View, partly in section, of some of the mechanism in the lower part of the control box.

My invention is shown applied to a Remington No. 12 typewriting machine, of which only a fragmentary showing is made in the of a portion drawings.

Most of the carriage return mechanism inthe particular instance illustrated in the T drawings is either identical with or so nearly PATENTOFFICE.

FREDERICK A. HABT,.UF new BRITAIN, connnc'rrcn'r, nssienoa TO REMINGTON like thatillustrated in my prior Patent 1,567,590, that it'has not been deemed neces sary to show said carriage return mechanism .in all its details.

Of the Remington typewriter, Fig. 1 shows the base casting 10, two of the corner posts. 11, the top plate 12, the. stationary carriage rails 13, the carriage truck '14 mounted on said rails by roller bearings 15, 1

the platen shift frame 16, and. platen 17.

The carriage return mechanism shown ink my prior patent includes an electricwmotor 20, the shaft of which is connected by a flex ible coupling 21 with a horizontal drive shaft on the forward end of which is mounted a beveled pinion 22 meshing with a beveled gear 23 which is loosely mounted on a vertical drive shaft 24.. All of the carriage return parts thus far referred to and some others are mounted in a casting 25 detachably secured to the base casting 10 of'thetype writer, and at its upper partinserted through a hole in the top plate 12, allas fully described in my prior patent. At its upper end the drive shaft 2a carries a drivepinion 26 which meshes witha rack 27 mounted on the carriage truck 14 by means of certain screws 28 which pass through longitudinal slots in the rack 27 so as to give to said rack a limitedfreedom ofmotion rightward when the carriagereturn'mechanism is first brought into operation, this freedom of motion being utilized to swing rightward a lever arm 30 projecting from a vertical rock shaft 31 and cont-rolled by a spring 32, said rock shaft being journaled in a housing 33 and acting through mechanism described in my prior patent to operate the line space mechanism of the typewriter. The beveled gear 23 is held against up and down motion by certain devices described in my prior patent. The lower end of the hub of this gear has one or more clutch teeth 34 adapted to 00-. operate with clutch teeth 35 provided on a clutch member 36 adapted to slide up and down on the shaft 24. A collar 37is n0n-- rotatably and non slidably mounted on the lower end of the shaft 24 and it has two arms 38 projecting oppositely therefrom. The clutch member 36 is countered-bored at its lower part forming a sort of annular apron that surrounds the collar 37 said apron being cut out from the bottom on opposite sides as shown in Fig. 4 to make two slots 40 into which the arms 38 extend. The sides of this cut-out preferably taper as shown. The clutch is closed by sliding the piece 36 upward at which time the arms 38 which communicate the motion of the shaft 34 to the clutch member 36, engage in the lower part of the cut-out 40. The clutch has to be opened at a time when it is turning and when there is pressure between the parts 38 and 40 and the taper in the cut-out 40 makes it easier to slip the clutch member down,

said taper having a sort of cam action which if it were not for the friction of the parts would itself tend to pull the arms 38 down. Moreover, the construction is such that the sliding friction is at points removed from the axis ofthe shaft 24, which also reduces the friction. This clutch opens I much easier than the one shown in my prior patent. No claim is made herein for the improvement in this clutch, however;

The clutch member 36 is formed with an annular groove into which a pin 41 projects from an arm 42 and said clutch member is controlled by the up and down motion of said arm. The forward end of said arm is shown in section in Fig. 3 and the rear end of it is shown in Fig. 1, said rear end being split and provided with a screw 43 to bind it on the right'hand end of a transverse rock shaft 39 the left end of which projects beyond the left-hand side of the typewriter frame where it has mounted on it a controlling arm 44 which is secured on the end of the shaft by a screw 45 threaded into the end of said shaft. The right-hand end of said shaft is journaled in the casting 25 and the left-hand end in a bracket 46 projecting rearward from a cast iron control box 47 which is secured by three screws 48 to the outside of the typewriter frame at the lefthand side thereof.

The lever arm 42 has a depending arm 50 connected with a push rod 51 which controls the circuit of the motor 20. When the arms 42'and 44 are rocked up the clutch and the circuit are closed and when they are rocked down the clutch and the circuit are opened. These arms are rocked upward by a suitable spring and they are normally held down by a latch 52 having a shoulder 49 engaging the front end of the arm 44, said latch having a hub 59 pivoted on a stud 53.

In order to release the latch 52 to set the carriage return mechanism into operation, said latch is provided with a pin 54 adapted to be engaged by a hook 55 on the end of a link 56, which link is pivoted at 57 to a lever 58, which lever is pivoted on a rock shaft 60. This rock shaft is connected to a spring-restored carriage return key, not shown herein but fully described in my prior patent. Said shaft has an arm 61 with a pin 62 which engages an arm 63 of the lever 58 so as to operate said lever when the key is depressed. The lever 58 is returned to its normal position by a spring 64 connecting the link 56 with a depending arm of the latch 52 so that this spring serves as a restoring spring both for the latch and the hook that operates it.

The lever 58 has a branch thereof projecting forward through a slot of the wall of the box 47 and pivoted to the lower end of a link 65 which at its upper end is pivoted to'an arm 66 projecting from the rear end of a rock shaft 69 which is journaled in a bracket 67 secured to the top plate of the typewriter. At its forward end said shaft has an upstanding arm 68 pivoted to the forward end of a push bar 70 which extends rightward to the middle of the machine where it can be operated by the margin stop of the typewriter carriage. At the end of a line of writing said margin stop can push said bar 70 leftward with the result of rocking the lever 58 and operating the hook 56 and latch 52 and thus setting the carriage return mechanism into operation.

' The carriage is arrested on its return motion by means of a margin stop 71 which strikes an arm projecting rearward from a slide bar 72 moving said slide bar about a half inch toward the right at which point it is arrested by a stop. All of this carriageoperated mechanism including the bars 70 and 72 and the devices for controlling them, is fully described in my prior patent. The bar 72 is pivoted to the upright arm of a bell crank 73 pivoted on the shaft 69, the leftward extending arm of which bell crank is pivoted to a link 74 which at its low-er end is pivoted to a lever arm 75 projecting forward through a suitable slot in the box 47 from a. rock shaft 76 to which said arm is secured. The shaft 76 is journaled at its rear end in the back wall of the box 47and at its f0l ward end in a framepiece or plate 77 secured by screws 78 to the box. The rock shaft 76 has extending downward and rearward therefrom an arm 80 having a. wrist pin 81 to which is pivoted a. slide bar 82 extending rearward and upward and having at its far end a slot 83 that rides on a pin or stud 84 projecting from the wall of the box 47. The under side of this bar is formed with a cam surface 85 and a dwell 86 adapted to operate an anti-friction roller 87 journaled in a wrist pin 88 projecting from the arm 44 so that in the latter part of the mot-ion of the bar 82said arm is depressed positively against the pressure of its spring causing the arm 42 to pull the clutch member 36 out of engagement and causing the push rod 51 to open the circuit of the motor.

In order to cushion the arrest of the carriage a dash-pot is made in the rear end of the box 47 consisting of a cylinder with a piston in it, the piston rod 91 extending forward through a bearing 92 cast integral with the box 47 and dash-pot- 90 and havingai colla-r 93 mounted thereon by a set screw to limit the inward motion of the piston. The piston rod 91 is slotted axially to receive a sortof coupling rod or bar 94 of rectangular cross section and extending nearly to the front of the box 47 said coupling rod being pivoted to the piston rod by a pin 95 held in place by a spring retaining device 96. Nealits forward end the bar 94 has anotch 97 like the inter-dental space of a gear rack, which notch is adapted to engage a tooth 98 of an arm 100, which arm is fast on and depends from the rock shaft 7 6, which shaft it may be mentioned is provided with a returning spring 101. The construction is such that if the bar 94 is in engagement with thetooth 98 when the carriage is returned said baryduring the last half inch or so of the motion of the carriage, will be drawn quickly forward and its motion cushioned by the dash-pot.

In order that this dash-pot may not come into operation on a short run of the carriage means are described in my prior patents for disconnecting the bar94 and therefore the dash-pot after every use thereof and leaving it disconnected until the carriage shall have traveled a predetermined distance, (say two or two and one-half inches) leftward before the dash-pot is again coupled up. If the carriage should be returned before it had traveled the predetermined distance it would be returned without operating the dash-pot. I have made some detail improvements in this mechanism. The forward end of the bar 94 is sometimes held up by a hook 102 pivoted at- 103 to the box 47 and influenced by a spring 104. The bar 94 is milled away on one side to make a cut-out or slot indicated at 105, the hook 102 extending into said slot and adapted to engage underneaththe shoulder formed by the forward end of the slot and thus to hold the bar 94 in its upper position where the notch 97 is in engagement with the tooth 98. When the dash-pot is operated the hook 102 swingsforward with the bar 94 until said hook is arrested by an arm 106 thereof engaging a stationary partof the machine. The bar 94 continues its forward motion to a sufiicient extent to release it from the arrested hook 102 at which time the forward end of the bar moves over a stud 107 projecting from the wall of the box 47. This stud is so locatedthat thebar 94 can drop down slightly before being arrested by it tothe position shown in Fig: 2', so that on the return motion of the bar 94 rear- L ward the shoulder made by the slot will strike the face of the hook 102 and force said hook back to the position shown in Fig. 1. As soon as the bar 94 moves off of the stud 107 it drops downward onto an arresting screw 108, the parts then occupying the position shown in Fig. 1 with the bar 94 entirely out of engagement with the tooth 98. If now the carriage return key were to be operated the dash-pot mechanism would not come into action at all.

In order to connect up the bar 94 when the carriage has traveled a predetermined distance leftward a rock shaft 110 is provided at the front of the machine and an arm 111 of said rock shaft is adapted to be depressed by a cam 112 mounted on the margin stop 71. The arm 111 is adjustable lengthwise of the shaft 110 so as to regulate the extent of the predetermined travel of the carriage referred to above \Vhen the arm 111 is depressed by the cam 112 and thus rocks the shaft 110 the latter, throughmechanism described in my prior patent, rocks a short shaft 113 pivoted in the box 47 and having an arm 114 projecting rearward therefrom. A headed wrist pin 115 on said. arm is embraced by a slot in the upper end of a link 116 which at its lower end has projecting therefrom a headed pin or stud 117 that passes through the bar 94. A downward motion of the arm 111 causes an upward motion of the arm 114 which momentarily raises the bar 94, whereupon the hook 102 snaps into place and retains the bar in its engaging position. \Vhen thereafter the carriage return mechanism is operated the bar 94 is operated and acts to cushion the arrestof the carriage. This bar and the dash-pot piston are restored to normal position by means of a spring 118, connected to a stud 120 projecting downward from the bar 94 and to a stud 121 fixed to the box 47.

One of the minor improvements sought to be protected in the present case is in the connection of the link 116 and hook 102 with the bar 94, the former connection being shown in detail in Fig. 6. It is necessary to prevent rotation of the bar 94 about its longitudinal axis but this needs to be done Ill] by means that do not put any considerable amount of friction on the bar. In the pres ent instance, as in my prior patent, the arm 100 which operates the bar 94 has secured to its right and left sides two cheek pieces 122 r of sheet metal which project beyond the tooth 98 and embrace the bar 94 on its right and left sides and these cheek pieces positively prevent rotation of the bar. But in case of any tendency of the bar to rotate there would be acramping between the bar and these two cheek pieces that would cause undesirable friction; In my prior patent the hook corresponding to the hook 102 engaged a stud projecting sidewise from the bar 9 1 and when the bar was hung from said hook the supporting force was off at one side and the weight of the bar tended to rotate it. In said patent the link corresponding to the link 116 also engaged a stud on the side of the bar 9% and the jerk of this link not only lifted the bar but also tended to rotate it. thus exerting a cramping action of horizontal position and the weight of the bar resting on said pin shown in Fig. 6 tends to keep the bar on an even keel, as it were, instead of tending to rotate it. It is undesirable that it be necessary to make any line adjustment of this link 116 and pin 117 and also in assembling and disassemblim the mechanism the parts have to be moved about to a certain extent. I therefore prefer to make the hole through the bar 91 for the reception of the pin 117 of a diameter appreciably greater than that of the pin so that the pin is quite loose in the hole. Furthermore, the length of the pin from the w; sher 123, against which it is riveted up, to the head of the pin, is greater than the thickness of the bar 94;. The whole construction is such that no cramping on this pin is possible and at the same time the tendency of the pin is to keep the bar 9% in its proper position and to prevent rotation of it. It will be recalled that the bar has to move out of engagement with the tooth 98 by its own gravity and it is highly desirable that there be no binding of the parts.

When the latch 52 is first tripped either by the travel of the carriage or by the carriage return key the arms 42 and 4a are thrown upward by a spring as hereinbefore explained and these arms restored by the cam when the carriage is arrested at the end of a return movement. At the end of a return movement the cam occupies about the position shown in Fig. 2 and it moves back toward its normal position shown in Fig. 1 step by step as the carriage travels leftward, it requiring several letter space steps of the carriage to restore this cam fully to its normal position. hen the clutch is thrown in by the spring it might happen that one of the clutch teeth 35 would strike at its end on the end of one of the teeth 3 1 and the upper motion of the clutch member 36 would thereby be arrested. In order to provide for this I so adjust the parts, as explained in my prior patent, as that the circuit through the motor is closed by the time the clutch teeth come into contact so that if said teeth strike on their ends the motor will start and the clutch member 36 will begin to rotate, which will immediately change the relative positions of the clutch tooth and cause the clutch member 36 to snap into full engagement. After a return of the carriage and during the first few steps of the carriage leftward there will come a time when the cam 85 will have reached to such point that if the arm 1-1 were released and allowed to move up against it the arm 42 will move for enough to close the circuit through the motor but not far enough to engage the clutch and the motor would then race and the operator might not know how to stop it. In order to prevent this contingency in my prior patent I put in alock to lock the latch 52 against releasement until the bar 82 had almost been restored to its normal position. This lock is rendered unnecessary by the hook construction of the link 56 shown in the present instance. This link is pivoted at 57 and it is normally held up in its operative position shown in Fig. 1 by means of a stud 124 projecting leftward from the bar 82. hen said bar is slid forward and downward to the position shown for example in Fig. 2 this stud moves a 'ay from the link 56 and allows the latter to drop to the position shown in Fig. 2 where it is arrested by the hub 59 of the latch If at this time the carriage return key be operated the link 56 will move lengthwise forward but will not operate the pin 5- 1, the hook 55 having dropped down below said pin. Said hook will not be raised high enough, to operate the pin until the bar 82 has been restored so far toward normal position as that the cam 85 will not arrest the roller 87 and arm 41 1 too soon. In order to adjust the stud 12s the latter is made in the manner illustrated in Figs. 1, 2 and 7. The bar 82 is counter-bored as shown in Fig. 7 and the stud 12 1 is made with a flange 125 lying in said counter-bore and said stud passes through the bar 82 and through a friction washer 126 into which it is riveted up. The projecting partof the stud is eccentric to the flange 125 and to the balance of the stud, and at its end said stud is made with a slot for a screw driver. Due to the eccentricity of the projecting part of the stud its up and down position can be regulated by turning it, and it will be held in its adjusted position by the friction of the washer 126.

The pinion 26 acts with considerable force on the rack 27, which rack in the case of a wide carriage, may be of considerable length compared with its other dimensions, and said rack is therefore more or less flexible. In order to maintain a positive engagement between the pinion and the rack, notwitheeann 1 and 3. Thisv sheet metal tongue may be secured to a fixed part of the machine in any suitable way. The Remington top plate has a transverse depression underneath the rear part of the carriage and in the present instance the tongue 128 consists of an upward projection of a T-shaped piece of metal p a pivot screw. 136 and preferably provided 130 which is secured to the up and down part of the top plate by two screws 131. By

this construction the rack is held positively.

against forward bending at a point immediately in front of the pinion so that the pressure due to the pinion has no tendency to flex the rack. i

When the cam 85 engages the roller 87 to depress said roller the upward reaction on the cam would cause the wall of the slot 83 to rub u on. the stud 84: with considerable force and cause friction and wear. For this reason I mount above the rear part of the bar 84 a,

roller or wheel 132, said wheel journaled on a stud 133 projecting from the wall of the box 47. This stud may be mounted in said box by the same friction washer and eccentric construction asis illustrated in Fig. 7 for the stud 124, the projecting end of the stud being provided with a screw driver slot as shown. this means the exact relation of the wheel 132 to the bar 82 can be adjusted. In order to retain the wheel on its bearing stud said wheel is made with a flange 134 which projects behind the bar 82 so that the wheel cannot come off of the stud so long as said bar is in place; but in assembling and disassembling the machine the wheel can be put on and off of the stud.

without any obstruction whenever the bar 82 is not in place. v

In case the power was turned off for any reason, or in case the machine was moved to a point where it was notconvenient to plug in on the electric light system the ma chine could be operated by hand in the ordinary way. The carriage return mechanism might cause some inconvenience under these conditions in case the carriage return key should he accidentally depressed or in case thecarriage should move to its extreme lefthand position where it would trip the latch 52- automatically. In either event the clutch would be thrown in and then when the carriage was pulled back to the right the operatorcwould have to operate the whole train of gearing back to and including the motor itself, and at the end of the return move- 'ment the operator would have to overcome the resistance of the dash-pot- 90. In case the clutch was closed under these conditions the operator could easily open it by hand tions.

with a friction washer 137 to prevent it from jarring out of either of its two posi- The'lower end of this lever consists of a sort of cam or nose 138 which is adapted to act on an arm 140 projecting rearward and upward from the lever arm 80. ,When' the handlever 135 occupies its rear position, shown in' Fi g. 1, it has no effect on the mechanism, but if it be drawn forward from that position to the position shown in Fig. 2 the'nose 138 acting on the arm 140 will rock the lever system 7 5, 80, 100 to its extreme operative position where the clutch is positively opened bythecam 85' and du'e'to the forward position ofthe bar 82 the hook link 56 will drop down to itsinoperative position so that even if it be operated by the carriage return key or by the motion of the carriage to its extreme left hand position it will not act on the latch 52. Inthis position of the parts the carriage return mechanism is almost entirely put out of action. 'When the carriage movesto its extreme left-hand position it would give a slight leftward motion to thebar .70 but as that bar atthat time is inoperative the resistance isinappreciable The lever arm 7 5 occupies its upper position which means that the slide bar 72 occupies itsextreme righthand position and does not have to be'slid rightward when the carriage is returned to initial position by hand, the arm on this sliderod merely acting as a final stop to arrest the carriage. The pinion 26 is still in mesh with the rackf=27 but that'imere ly causes the vertical shaft 24 to be rotated when the carriagemoves in either direction. This causes, no appreciable resistance because nothing is connected with the shaft at that time. The end of thecam 138 is a dwell, so that the disablinglever will remain in itsFig. 2 position until it is pushed back by hand. v l p i The dash-pot 90 as describedin'my prior patent is provided withvents which can be controlledby adjustable devices 141 and 142. In the machine as usually manufactured the speed of the carriage is controlledin part by a governor not shown in r the present drawing; and sometimes a rheostat is em ployed to regulate the power of the motor,

There are thus various ways in which it is possible for the person who operates or has charge of the machine to vary the effect of the motor and it may sometimes happen by reason of some misadjustment, that the motor may not fully restore the carriage to its intended right-hand position. In a case of this kind the carriage would usually run rightward until it stopped and then would settle back a short distance left-ward until caught by the typewriter escapement exactly in some letter space position. This would usually be after the dash-pot had come into action and therefore after the bar 82 had made some part of its forward sliding motion. It has been found that when the action referred to occurs at all the carriage and the bar 82 usually move far enough to open the clutch and break the circuit; but sometimes when the carriage settles back to the position determined by the escapeinent the bar 82 will move justfar enough back and the arm l i will therefore rise just far enough to close the circuit without closing the clutch and thus set the motor to .racing. If then the operator should chance to strike a printing key or the space bar and allow the carriage to take another step leftward the arm 44 would rise a little higher and bring the clutch teeth into engagement while the carriage was standing still and while the motor was racing. The result would be that the clutch teeth 35 running at high speed would collide with the clutch teeth 34, which at the time would be stationary and the mechanism would be subjected to a very severe strain or jolt. In order to provide for this possibility of trouble with the machine I have made on the upper part of the latch 52 a series of fine ratchet teeth 1 13, said teeth having their upper edges inclined and their lower edges abrupt and the end of the arm 4: 1 is made with a good clean angle for cooperation with these fine teeth. With this improvement if the carriage is stopped before the arm as has been moved down quite far enough to be caught by the main shoulder 19 of the latch 52 it will be caught by one of these fine teeth 14:3 in substantially the lowest position to which it was moved. When therefore the carriage settles back against the escapement and the bar 82 moves slightly rearward there is no consequent upward motion of the arm at and if the circuit was broken at all it will remain broken notwithstanding the settling back of the carriage and it will remain broken even if the operator strikes the space bar and moves the carriage leftward. Tn fact the operator can go on and use the machine just the same as of the arm set had been drawn down its full distance, except that the carriage would lack a letter space or two of having been restored fully to its contemplated right-hand position. It could of course happen that the extreme position to which the arm l i was depressed would be one in which. the clutch was open but the circuit not yet open; but I have found by experience that this rarely occurs.

In my prior patentit was explained that the mechanism in the control box 47 is so designed that a large part of it can be disassembled with hardly any use of tools other than the fingers of the workman. The airrangements in this respect have been somewhat modified and improved in the present instance.

In my prior patent the hook corresponding to the hook 102 was pivoted on a shaft which was supported at its outer end by a frame plate somewhat like the frame plate 77, and the lower end of said hook was out-- side or to the left of the bar 9%. 1n the present instance the cut-out 105 is at the inner side of said bar and the hook is therefore to the right of the bar 9 1- which makes it easier to remove said bar 94. lrloreover said hook is now pivoted on a headless stud. the bar itself preventing the hook from full ing off of said stud but the hook can be instantly removed once the bar 9a itself is out of the way. To remove the bar 91- it is only necessary to unhook the spring 118, turn aside the spring retainer 96, remove the pivot pin 95, slip said bar 94L- endwise forward until its rear end clears the stud 53 and then move the bar 9 1 rearward above said stud and depress the arm 1M until the slot in the upper end of the link 116 is in line with the elongated head of the stud 115, whereupon said bar and link 116 come out of the machine without dilii' culty. The hook 102may then be simply slipped off of its pivot and removed. The hooked link 56 is pivoted at 57 on a headless stud projecting leftward from the lever Once the link 116 and hook 102 are removed the spring 64 may be unhooked and the link 56 lifted out with the fingers. The link 56 is normally prevented from motion right ward by the lever 58-and latch 52 and it is prevented from motion leftward by the link 116 (Fig. 8) so that this link 56 does not fall out when the machine is assembled but can be lifted out as soon as the parts 116 and 102 are removed.

Thelatch 52 is made with a rearwardiy and eownwardly directed arm 1 1 1 that ordinarily stands in a cutout 1 19 milled into the casting where the barrel or bearing 92 of the piston rod is connected with the back wall of the box 17 A milling cutter has to be used to surface off various points in the back wall of this box and the same cutter may be used to cut a slot or groove in the casting at the point indicated. With the spring 6 1 unhooked and the link 56 removed the latch 52 may be'swung forward until seesaw arm 144 is-clear of the casting Apart 92,

'was made with an elongated head-butit is now made headless and instead an ear-145 is made on the upper part of the lever arm 44 so as slightly to overlap the bar 82 and to prevent it from coming off of the stud 84. At its forward end the bar 82 is simply pivoted on a headless stud 81 projecting from the lever and it is retained against displacement by a headed stud 146 passing through the wall of the box 47 and secured by being riveted into a friction washer on the same general principle as the washer 126 shown in Fig. 7. This headed stud can be turned with a pair of pliers so as normally to overlap the bar 82 as shown in the drawing and it can be turned aside like an old-fashioned button-fastener when it desired to remove the bar. 'When this stud is turned and the lower end of the bar 82 is lifted off of its stud 81 the arm 44 can be depressed by hand and the bar 82 manipulated into a position where it will pass the ear 145. When the bar 82 has been removed the wheel 132 can be simply lifted off its stud.

The devices just above described greatly facilitate the manufacture of this mechanism and also the work of the repairman in caring for it.

Various changes may be made in the details of construction and arrangement without departing from my invention.

lVhat I claim as new and desire to secure by Letters Patent, is:

1. The combination with a traveling carriage, power mechanism forreturning said carriage, a part arranged to be moved at the end of the return movement of the carriage, and a shock absorber operated by said part, of a device operable by hand to lock said part in its moved position when it is desired notto use the power mechanism.

2. The combination with a traveling carriage, power mechanism for returning said carriage, and parts-moved at the end of the return movement of the carriage and acting to stop the operation of said power mechanism, of a device. operable by hand and acting to move certain of said parts to their operated positions and to retain them there to prevent the use of the power mechanism.

3. The combination with a traveling carriage, power mechanism for returning said carriage, and devices moved at the end of the return movement of the carriage and acting to stop the operation of said power mechanism, of a cam and dwell operable by hand when it is desired to put the power mechanism out of use, said cam acting to move said devices to their operated positions and said dwell then acting to retain them there.

4. The combination'with a traveling carriage, of acarriag'e returning motor, a pinion rotated by said motor, a rack on the carriage driven by said pinion, and a guide device fixed to the stationary framework of the machine andacting on said rackadjacent said pinion to prevent flexure of said rack.

The combination with a traveling-can riage, a carriage returning motor, a pinion driven by said motor, and a rack driven by said pinion, of a slot in said rack, and a fixed part projecting into said slot adjacent said pinion to prevent flexure of said rack.

6. The combination with a traveling carriage, an electric motor for returning said carriage, connections between said motor and said carriage including a clutch, a spring operated device acting first to close the circuit of said motor and afterward to close said clutch, and means for restoring said spring operated part at the end of the return movement of the carriage, of a latch for normally holding said part against the action of its spring, said latch having a main shoulder for engaging said part and having also fine teeth to hold said part in case it was not quite restored to its full intended normal position.

7 The combination with a traveling carriage, an electric motor for returning said carriage, connections between said motor and said carriage including a clutch, a spring operated device acting first to close the circuit of said motor and afterward to close said clutch, and means for restoring said spring operated part at the end of the return movement of the carriage, of a detent for normally holding said part. against the action of its spring, said detent having fine teeth to hold said part in the farthest posh tion to which it was restored even in case said part be not fully restored to the intended position.

8. The combination with a traveling carriage, power operated means for returning said carriage, and a dash-pot to act'as a shock absorber at the end of a return motion, said dash-pot being provided with a bar 94 capable of being connected up to and disconnected from the carriage operated device, of a link for raising saidbar to its con necting position, said link having a stud rigidly mounted thereon and projecting loosely in a hole through said bar so as to allow some freedom of relative motion between the link and the bar but so as to have a tendency to keep said bar on an even keel against neoting position, said link having a stud rigidly mounted thereon and projecting loosely in a hole in said bar so as to allow some freedom of relative motion between the link and the bar but so as to have a tendency to keep said bar on an even keel against rotation, and a hook for supporting said bar in its raised position, said hook acting on said bar at or near the axis thereof so as not to turn said bar.

Signed at the city of New York, in the county of New York and State of New York this lth day of August, A. D. 1926.

FREDERICK A. HART. 

